Corrugated long period fiber gratings as band-rejection filters

摘要

In summary, we demonstrate, for the first time to our knowledge, a new technique to fabricate a loss and wavelength tunable LPFG by varying the stress and twist applied to a corrugated structure where the LPFG is defined. Such a tunable band-rejection filter may find useful applications in optical fiber communication such as gain-flattening of an EDFA.